This is big news... If you love your Zen amp, and your ears are dialed into it, this will frankly blow you mind. You'll shake your head for at least a year, every time you listen to it. It improves the power, improves the punch, improves the midrange, basically it improves everything.

Well the mod is a success. I've had my Zen for many years now, and it has never ceased to impress how high it's fidelity can get within reasonable means. This tweak has brought this amp to another level, and it's exciting to think that it can be done without raising the cost much. Thanks to Mr Hazen and Mr Deckert for discovering yet another way to make these unassuming amps embarrass expensive gear.

The word 'bloom' keeps coming up in my mind. Dynamics are improved by a large degree. Everything is now more distinct in the separations of instruments in the image, and subtle textures in voices and recording effects. Everything sounds fuller as music surrounds your area with more presence.

It absolutely sounds more pleasant to the ear. The speakers do seem to be disappearing more and a sibilance noticeable on certain albums has smoothed out revealing more details in the mix.

Bass is also more detailed and is finding perfect balance with the rest of the spectrum.

For such a subtle change to the circuit, the effect is really quite surprising. I'm finding it really easy to switch off critical thought and take in the recordings. It's a very inviting presentation.

I have already upgraded to V-Caps, and I would say this is easily as beneficial if not more. Like the V-Caps, it enhances every aspect of the amp without losing any of it's best qualities.

The upgrade is certainly worth the asking price. And considering all those used zen amps out there, offering a lifetime warranty along with the upgrade is a sweet deal.

SteveIn Taboo schematics, I see the the suppressor grid connected to the cathode. Is this internally connected? Because, I see nothing connected to pin 6 inside the amp (pin 6 is the suppressor grid I believe?).